Low-voltage power circuit breakers (LVPCB) are often referred to as air circuit breakers (ACB). Air circuit breakers are typically of the draw-out design, although they can be bolted directly to the bus. Air circuit breakers are used for applications in which there is a requirement for a more sturdy design …

Low- and medium-voltage Vacuum circuit breakers are similar in construction and operation. One of the primary differences between them is that the OCPDs on LVPCBs are mounted on the circuit breakers, while medium-voltage circuit breakers use protective relays, which are typically mounted on the enclosure door. Medium-voltage circuit breakers have …

A schematic diagram is a drawing that shows electrical system circuitry with symbols that depict electrical devices and lines representing conductors. Only qualified persons should review schematic diagrams and perform work on circuit breakers. A qualified person is a person who has special knowledge, training, and experience in the installation, …

As you know, a resistor is a component that is designed to provide specific amount of resistance. Resistors are classified as being either fixed or variable. A FIXED RESISTOR is one that has specific ohmic value that cannot be changed by the user. A VARIABLE RESISTOR is one that can …

Introduction This lesson will cover remote access and how to better secure data transmissions. Remote access methods describe how a client connects to the local area network (LAN) remotely. In order for the client to access the LAN, they have to be authenticated through a remote access server. Network protection …

Introduction This lesson will cover IP address management and a topic everybody loves, subnetting. There will be information in this lesson that will help identify network and host portions of an IP address. Lastly, this lesson will explain how to calculate the number of host and subnets needed on a …

Introduction In this lesson you will learn about aspects of routing and switching when configuring a network. The options and features discussed provide for effective management of a local area network (LAN). Lesson Objectives By the end of this lesson, you will be able to: Identifying the steps involved with …

Introduction In this lesson you will learn about Wide-Area Network (WAN) technology, digital vs. analog signal transmission, circuit-switched and packet-switched networks. You will also be introduced to multiprotocol label switching and its application in a networked environment. Lesson Objectives By the end of this lesson, you will be able to: …

Introduction In this lesson you will learn about how to secure networks from unauthorized individuals. Several different methods for achieving security will be discussed. A network administrator should be concerned whether or not the “right” people have access to the network. Lesson Objectives By the end of this lesson, you …

Introduction This article will introduce how computers and other hosts communicate internally and externally. A discussion of how data travels from the host, to the media will introduce dependent topics which should give an in-depth view of host communication. Lesson Objectives By the end of this lesson, you will be …

Introduction This lesson will examine the different media types, standards, and wire distributions involved in a networked environment. Lesson Objectives By the end of this lesson, you will be able to: Categorize standard media types and connectors. Identify components of wiring distribution. Compare and contrast different Local Area Network (LAN) …

Firewalls are responsible for either “blocking” or “allowing” data traffic to an internal network. By default, firewalls use what is called “implicit deny;” until a network administrator explicitly allows a certain type of traffic, it is blocked. The data traffic that a network administrator blocks or allows is part of …

Introduction In this lesson you will be introduced to tools and software used to manage a network. Often a need will arise to identify when a cable goes bad or a router/switch is not functioning as it should. A network administrator will use these tools and software to determine where …

Introduction During this lesson you will be introduced to the components that make up a network as well as knowing the components of a network, several different models and topologies will also be discussed. Lesson Objectives By the end of this lesson, you will be able to: Describe TCP/IP model …